I've only dealt with ARM in a few areas like mutex/locking asm helpers, where the best sequence to use is different for different sub-architectures.
I can see that the break of source compatibility would make v8/ARM64 a bigger challenge if perfect source-level ASM compatibility has been the norm up until now. It still sounds more like an ia32-to-x86_64 move than an ia32-to-itanic move, though.
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